Metadata Report for BODC Series Reference Number 1170672

Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags

Metadata Summary

Data Description

Data Category

Hydrography time series at depth

Instrument Type

Name	Categories
Vemco Minilog12 temperature recorder	water temperature sensor

Instrument Mounting

subsurface mooring

Originating Country

United Kingdom

Originator

Dr John Huthnance

Originating Organization

Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)

Processing Status

banked

Online delivery of data

Download available - Ocean Data View (ODV) format

Project(s)

Data Identifiers

Originator's Identifier	POSEIDON_328_2407
BODC Series Reference	1170672

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2005-09-07 06:00
End Time (yyyy-mm-dd hh:mm)	2005-09-22 14:52
Nominal Cycle Interval	120.0 seconds

Spatial Co-ordinates

Latitude	60.21170 N ( 60° 12.7' N )
Longitude	4.64320 W ( 4° 38.6' W )
Positional Uncertainty	0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth	552.0 m
Maximum Sensor or Sampling Depth	552.0 m
Minimum Sensor or Sampling Height	1.0 m
Maximum Sensor or Sampling Height	1.0 m
Sea Floor Depth	553.0 m
Sea Floor Depth Source	CRREP
Sensor or Sampling Distribution	Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum	Approximate - Depth is only approximate
Sea Floor Depth Datum	Approximate - Depth is only approximate

Parameters

BODC CODE	Rank	Units	Title
AADYAA01	1	Days	Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01	1	Days	Time (time between 00:00 UT and timestamp)
ACYCAA01	1	Dimensionless	Sequence number
TEMPPR01	1	Degrees Celsius	Temperature of the water body

Definition of Rank
Rank 1 is a one-dimensional parameter Rank 2 is a two-dimensional parameter Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Problem Reports

No Problem Report Found in the Database

Data Access Policy

Open Data supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."

Narrative Documents

VEMCO Minilog12-TR temperature logger

Description

The VEMCO Minilog12-TR is a miniature data logger that records temperature at a user programmed time interval. It is housed in a waterproof cylinder and the temperature sensor is mounted on a protruding stainless steel probe.

Specifications

Memory	16k, 32k or 64k. Temperature readings stored in Electrically Erasable Programmable Read Only Memory (EEPROM). Logging duration is between 3 hours and 5 years depending on the logging interval.
Data Retention	20 years.
Temperature Range	-5 to 40°C; 0.015°C resolution; ±0.1°C accuracy with factory calibration.
Maximum Depth	1000m
Communication Link	Downloaded via PC interface box. Connects to computer via DB9 connector. No external connections are required. Full memory downloads in 6 minutes for 16k.
Battery	Internal lithium battery with life of up to 5 years or up to 1200 full deployments.

For more information please see the Manufacturer's information sheet.

PO328 Moored Minilogger sensors originators processing document

Data processing

The thermistor inside the Vemco minilogger initially produced an analogue value representing how its electrical resistance changes with temperature. This value was converted into a digital value using an analogue-to-digital (AtoD) converter inside the logger. When the data were downloaded an internally stored calibration was applied to the value to give the temperature in °C and the raw digital output as AtoD. Next, the data were converted from binary to ASCII format by the data originator. Data files supplied to BODC included both the digital temperature value as well as the raw digital output. The originator also supplied suggested correction factors for data from some of the loggers (summarised below). These were calculated by the originator to maintain a decreasing temperature-depth profile. The corrections have not been applied to the data.

Corrections supplied with the data

	Serial number	Nominal height above seabed (m)	Correction (°C)
East mooring	2106	49	0.08
	5230	41	-0.06
	8961	17	0.9
	8947	5	0.6
South mooring	2406	48	-0.06
	2427	40	-0.18
	2192	32	-0.05
	2196	20	-0.1
	2425	16	-0.05
	2110	12	0.05
	2185	8	-0.05
West mooring	2421	50	0.85
	2195	30	-0.12
	2197	6	-0.35

PO328 Moored VEMCO Minilogger Sensor Processing undertaken by BODC

Data were received by BODC in ASCII files for each sensor deployed. The series were reformatted to internal BODC format using established procedures. The following table details mapping of variables to BODC parameter codes.

Parameters to be processed further

Originator' Variable	Units	BODC Parameter Code	Definition of Parameter Code	Units
Celsius	°C	TEMPPR01	Temperature of the water column	°C

Parameters not to be processed further

Originator's variable	Description
Temp(AtoD)	Raw digital output of sensor

The raw digital output of the sensor supplied by the originator has been archived and is available on request if required.

BODC Quality Control

The reformatted data were visualised using BODC in-house software. Suspect data were marked by adding an appropriate quality control flag, and missing data marked by both setting the data to an appropriate absent data value and setting the quality control flag.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd)	2005-09-08
End Date (yyyy-mm-dd)	2005-09-21
Organization Undertaking Activity	Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of Organization	United Kingdom
Originator's Data Activity Identifier	PO328_SouthADCP
Platform Category	fixed benthic node

PO328 South ADCP deployment (Frame A)

Deployment and recovery

	Deployment	Recovery
Time (UTC)	09:46 - 09:56 on 08/09/2005	12:30 on 21/09/2005
Nominal water depth	597 m	597 m
Position	60° 12.70'N 04° 38.59'W	60° 12.80'N 04° 38.16'W

The ADCP frame was deployed at from FS Poseidon cruise PO328. Deployment was from the afterdeck using the A-frame and on-load release hook. The ADCP frame freefell to the seabed and was tracked to the bottom using the Benthos deck unit and over-side transducer. The ADCP frame was recovered without difficulty and rose at a rate of just under 1 ms^-1. Recovery was over the port side of the ship, the strayline being grappled and the frame being winched on board. Data were downloaded from the ADCP and Minilog instruments successfully.

Mooring setup

The ADCP was mounted on a modified pop-up ADCP frame which had been fitted with five Benthos glass buoyancy spheres. The frame was attached to a releasable aluminium bed frame fitted with lead ballast weights. A 12 m stray-line with pellet floats was attached to the top of the frame to facilitate recovery. The release mechanism was a standard titanium release fitted with two "fizz link" burn wires. Each of these can be fired independently, only one being needed to release the instrument frame. In addition to the RD Instruments 150 kHz broadband ADCP each frame had a Vemco Minilog temperature logger and two Benthos transponding releases.

Setup of the ADCP

Number of depth cells	60
Depth cell size	4 m
Time per ensemble	2 minutes
Time per ping	4 s
Number of pings per ensemble	30
Data recorded	Velocity, correlation, echo intensity, percent good, heading, temperature, pitch, roll
Coordinates	Radial beam coordinates
Pitch and roll correction	No correction applied

Rig description

Instrument	Serial number	Deployment details (UTC)	Clock set First data (UTC)	Recovery details (UTC)	Last data Time off (UTC)	Comments
RD Instruments 150 kHz ADCP, broadband	1148	18:23:00 04/09/2005	19:00:00 04/09/2005	15:46:00 21/09/2005	15:48:40 21/09/2005
Vemco 12-bit Minilog	2407	18:00 05/09/2005	06:00:00 07/09/2005	14:52 22/09/2005		Sampling interval of 2 minutes. Instrument calibrated 07/2001
Benthos acoustic transponder	69679	Receive frequency 11.5 kHz, Transmit 12.0 kHz Enable code C; Release code D
Benthos acoustic transponder	72850	Receive frequency 11.5 kHz, Transmit 11.0 kHz Enable code A; Release code F

Cruise

Cruise Name	PO328
Departure Date	2005-09-06
Arrival Date	2005-09-25
Principal Scientist(s)	John Huthnance (Proudman Oceanographic Laboratory)
Ship	FS Poseidon

Complete Cruise Metadata Report is available here

Fixed Station Information

No Fixed Station Information held for the Series

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag	Description
Blank	Unqualified
<	Below detection limit
>	In excess of quoted value
A	Taxonomic flag for affinis (aff.)
B	Beginning of CTD Down/Up Cast
C	Taxonomic flag for confer (cf.)
D	Thermometric depth
E	End of CTD Down/Up Cast
G	Non-taxonomic biological characteristic uncertainty
H	Extrapolated value
I	Taxonomic flag for single species (sp.)
K	Improbable value - unknown quality control source
L	Improbable value - originator's quality control
M	Improbable value - BODC quality control
N	Null value
O	Improbable value - user quality control
P	Trace/calm
Q	Indeterminate
R	Replacement value
S	Estimated value
T	Interpolated value
U	Uncalibrated
W	Control value
X	Excessive difference

SeaDataNet Quality Control Flags